Coupled FEM and lumped circuit model of the electromagnetic response of coaxially insulated windings in two slot cores

Abstract

SUMMARYThis paper presents a coupled FEM and lumped circuit modelling approach that is primarily intended for high-frequency and overvoltage simulations of rotating electric machines with coaxially insulated windings, such as Powerformer and Motorformer. The magnetic fields and their interaction with the conductors of the winding are simulated with the aid of a FEM-program. The displacement current and its losses are modelled with an external lumped circuit. To consider eddy current losses, the stranded conductors and the laminated steel cores are replaced by homogeneous bodies with similar losses over a wide frequency range. The approach is illustrated and experimentally verified for a set-up with a cable wound around two slot cores. The model agrees well with measurements up to 1 MHz.

Investigation into the Thermal Behavior and Loadability Characteristic of a YASA-AFPM Generator via an Improved 3-D Coupled Electromagnetic-Thermal Approach

“…In the typical case, lower iterations are conducted; it should be mentioned that the electromagnetic analysis implemented in the steady-state reduces time, while the transient operating mode that takes a great deal of time is solved. While various methods to conduct the thermal analysis of electrical machines are not linked with electromagnetic analysis during the simulation, it is vital to simulate magnetic and thermal model simultaneously since the both are dependent on each other [14][15][16].…”

“…The modeling of the machine losses as the heat sources requires an electromagnetic model. A coupled electromagnetic-thermal modeling technique was described for computing heat losses and evaluating temperature distribution in some electrical machines [14][15]. Furthermore, the thermal behavior of AFPM machines has been investigated through a 3-D thermal -magnetic finite-element analysis [16][17].…”

An improved model of cage induction machines for fast transients studies

“…In 2007, Holmberg and Leijon presented a coupled FEM and lumped circuit modeling approach for high‐frequency and overvoltage simulations of rotating electrical machines with coaxially insulated windings . In 2014, Sahoo and Gopalakrishna and in 2017, Chaouche et al used FEM analysis to obtain circuit parameters of the ladder network .…”

“…In 2007, Holmberg and Leijon presented a coupled FEM and lumped circuit modeling approach for high-frequency and overvoltage simulations of rotating electrical machines with coaxially insulated windings. 28 In 2014, Sahoo and Gopalakrishna and in 2017, Chaouche et al used FEM analysis to obtain circuit parameters of the ladder network. 29 30 In 2017, Subramaniam et al combined finite element model of the CIM with an external circuit and detected fault in the machine in which computation unit was considered to be windings of one phase of the machine and fault detection was performed in a low spectrum of frequencies.…”